Because you talk trash on people you don't even know. There are about 5 people in the world who are allowed to do that, and at last check Just1111 isn't one of them. Until you learn to argue correctly and to keep baseless flames out of your discussion, please lurk more.
To everyone in this thread:
Items and certain stages are unused in serious tournaments because in a 5 minute match the statistics
don't even out. Over the course of 100 matches, then yes, the statistics argument is valid. Not over one match, one set, or even one tournament.
For clarification, I'll give an analogy. In a scientific experiment, one variable is tested. All others are controlled as closely as possible to stop them interfering. In Melee, the variable that is tested is
skill. Most items can be included in that "skill variable." However--and this is a BIG however--certain items like exploding capsules, crates, and barrels can completely change the course of a match, and therefore a test of skill, based on a totally random element. There is no way to use skill and experience to cancel that otherwise game-winning move that suddenly killed you because a boolean variable decided to be a 1 instead of a 0.
Taco, you raise some valid points and I can respect you due to your obvious knowledge in Melee and other games. I've never played Counter-Strike, though I can guess what it's like (it's a first-person shooter... come on.) I expect that one bullet deviating slightly could possibly affect the outcome of a game, set, match, tournament in the same way it does in Melee. But not to the same magnitude. Not
remotely.
Container-type items have a 12.5% chance to explode instead of bestowing precious rewards. Heart containers heal 100% damage and can be picked up in the air. Bob-ombs (which I see nobody has spelled correctly thus far) explode when you attack them.
Stages like Hyrule are banned because a character like Fox, Shiek, Captain Falcon, et al, can hit you once then run away for the rest of the match, and there is nothing you can do about it. Most stages that introduce completely random elements are banned because of that. Notice that Poké Floats and Rainbow Cruise are both MLG tournament-legal. They follow a set pattern that can be predicted and used by a player with knowledge.
tl;dr Most items require skill, but certain ones are gamebreaking. There is no way to turn off exploding barrels/crates/capsules without all other items also being restricted. The trade-off is worth it. Some stages are banned because they introduce a totally random factor or are completely biased towards certain characters. No, FD isn't totally neutral. Kanto is the best.